Easier to deploy by avoiding merge conflicts in production

.env.prod.example

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+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY="7(2w1sedok=aznpq)ta1mc4i%4h=xx@hxwx*o57ctsuml0x%fr"
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG=false
+
+DOMAIN=your.domain.here
+EMAIL=your@email.here
+
+## Leave unset to allow all hosts
+# ALLOWED_HOSTS="localhost,127.0.0.1,[::1]"
+
+OL_URL=https://openlibrary.org
+
+## Database backend to use.
+## Default is postgres, sqlite is for dev quickstart only (NOT production!!!)
+BOOKWYRM_DATABASE_BACKEND=postgres
+
+MEDIA_ROOT=images/
+
+POSTGRES_PASSWORD=securedbpassword123
+POSTGRES_USER=fedireads
+POSTGRES_DB=fedireads
+POSTGRES_HOST=db
+
+# Redis activity stream manager
+MAX_STREAM_LENGTH=200
+REDIS_ACTIVITY_HOST=redis_activity
+REDIS_ACTIVITY_PORT=6379
+REDIS_ACTIVITY_PASSWORD=redispassword345
+
+# Redis as celery broker
+REDIS_BROKER_PORT=6379
+REDIS_BROKER_PASSWORD=redispassword123
+CELERY_BROKER=redis://:${REDIS_BROKER_PASSWORD}@redis_broker:${REDIS_BROKER_PORT}/0
+CELERY_RESULT_BACKEND=redis://:${REDIS_BROKER_PASSWORD}@redis_broker:${REDIS_BROKER_PORT}/0
+
+FLOWER_PORT=8888
+FLOWER_USER=mouse
+FLOWER_PASSWORD=changeme
+
+EMAIL_HOST="smtp.mailgun.org"
+EMAIL_PORT=587
+EMAIL_HOST_USER=mail@your.domain.here
+EMAIL_HOST_PASSWORD=emailpassword123
+EMAIL_USE_TLS=true
+EMAIL_USE_SSL=false
+
+# Set this to true when initializing certbot for domain, false when not
+CERTBOT_INIT=false